People often confuse speed with velocity. These two terms are different from each other and should not be interchanged. Difference between speed and velocity is a common question in physics exams. Although both these terms indicate movement with respect of time, still there are numerous differences between the two.

**NOTE:** SI Unit of * both* speed and velocity is

*meter per second*.

## Table of Differences between Speed and Velocity

Basis of Difference | Speed | Velocity |
---|---|---|

Definition |
Speed is the rate at which an object covers a specific distance. | Velocity is the rate at which an object changes its position. |

Type |
Speed of a scalar quantity | Velocity is a vector quantity. |

Formula |
Formula of calculating speed is:speed = distance / time |
Formula of calculating velocity is:velocity = dx / twhere dx is displacement and t is time. |

Direction |
Speed remains same if a moving object changes direction. | Velocity changes if a moving object changes direction. |

Magnitude |
Speed can not be zero or negative. | Velocity can be negative, positive or zero. |

Interrelation |
Speed or a moving object may or may not be equal to its velocity. | An object may have several velocities while maintaining the same speed. |

Example |
An object may accelerate from zero to its top speed in a given time but its speed is taken as average speed. For example, a car may accelerate from 0 km/hr to 100 km/hr in five seconds. But its average speed will be counted as its speed. | Direction is always associated with velocity. For example, if an aircraft is moving in south-west direction as a speed of 400 km/hr; its velocity will be 400 km /hr, south-west. |

## Speed vs Velocity with Image Example

The following image simply demonstrates the difference between speed and velocity:

The following image shows how change in direction changes velocity while speed may remain same.